Wide dynamic range high frequency signal transmission utilizing

Details Wide dynamic range high frequency signal transmission utilizing Wide dynamic range high frequency signal transmission utilizing

1992-09-14

1994-08-16

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359181, 359173, 359115, 359188, H04B 1004, H04J 1400

Patent

active

053391870

ABSTRACT:
A logarithmic video detector/r.f. limiter amplifier provides an amplitude-limited r.f. carrier version of an input signal. The amplitude-limited signal is either employed directly or is coupled to a mixer that produces a down-converted constant-amplitude signal which is applied to a first optical modulator which in turn is coupled to an optical source. The optical modulator is coupled to an optical fiber that carries the frequency component of the input signal at a first light wavelength. The amplifier also supplies a signal which is dependent upon its logarithmic detector response that represents the amplitude component of the input signal. This signal is supplied to a VCO which drives a second optical modulator which is coupled to a second optical source and produces an optical signal of a second light wavelength. In a first embodiment, both optical signals are supplied to the receiver over the same optical fiber link. In a second embodiment the signals that contain frequency and amplitude information are each coupled over a separate optical fiber to the receiver. In a third embodiment, the signal that contains frequency information is coupled over an optical fiber while the signal that contains amplitude information is coupled as an electrical signal to the receiver.

REFERENCES:
patent: 4158478 (1979-06-01), D'Auria et al.
patent: 4695127 (1987-09-01), Ohlhaber et al.
patent: 4722081 (1988-01-01), Fujito et al.
patent: 4726644 (1988-02-01), Mathis

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